Pronunciation: [lˈə͡ʊbɑː bɹˈɒnkəs] (IPA) 
The lobar bronchus is a term that is frequently used in medical discussions surrounding the anatomy of the lungs. This term refers to a branch of the bronchial tree that supplies air to a specific lobe of the lung. One interesting aspect of the spelling of "lobar bronchus" is that it includes a "b" sound in each of the two parts of the word. In IPA phonetic transcription, this word would be written as "loʊbər brɒŋkəs".
A lobar bronchus, also known as a secondary bronchus, refers to the branching structure of the bronchi within the respiratory system. It is defined as the bronchus that arises directly from the main bronchus, also known as the primary bronchus, and supplies air to a specific lobe of the lungs. The main bronchi divide into two primary bronchi, one for each lung, which further divide into lobar bronchi that correspond to the number of lobes in each lung.
In humans, the right lung consists of three lobes – the superior, middle, and inferior lobes – and thus has three lobar bronchi. The lobar bronchi further divide into smaller branches called segmental bronchi, which go on to supply air to specific segments of the lungs. Similarly, the left lung consists of two lobes – the superior and inferior lobes – and therefore has two lobar bronchi.
The lobar bronchi are lined with mucous membranes that are covered in cilia, microscopic hair-like structures that help to move and filter mucus and foreign particles away from the airways, protecting the lung tissues. The lobar bronchi are important conduits for air, responsible for delivering oxygen to the specific lobes and segments of the lungs, and expelling waste gases, such as carbon dioxide, during exhalation.
The word "lobar bronchus" is composed of two parts:
1. "Lobar" comes from the Latin word "lobus", meaning "lobe". It refers to a distinct section or part of an organ, particularly used in the context of lungs. Lobar bronchi are the primary branches of the bronchial tree that supply air to the specific lobes of the lungs.
2. "Bronchus" also comes from Latin, derived from the Greek word "bronkhos", meaning "windpipe" or "throat". It refers to the large passageways in the respiratory system that deliver air from the trachea into the lungs.
So, the etymology of "lobar bronchus" can be traced back to Latin and Greek words that individually denote the distinct lung lobes and the main air passages within them.
